Table 1.

Temperature responses of leaf gas-exchange parameters under different nitrogen (N) supplies at two growth stages.

Growth Stage	N Supply	Leaf Temperature (°C)	A (µmol m−2 s−1)	gs (mol m−2 s−1)	gm (mol m−2 s−1)
Mid-tillering	N0	15	10.2 ± 1.1 c	0.350 ± 0.124 a	0.063 ± 0.006 c
		25	20.3 ± 1.0 b	0.213 ± 0.020 b	0.149 ± 0.027 b
		35	24.6 ± 2.6 a	0.294 ± 0.068 ab	0.207 ± 0.043 a
	HN	15	14.0 ± 1.4 b	0.452 ± 0.161 a	0.096 ± 0.032 c
		25	31.7 ± 4.1 a	0.372 ± 0.087 a	0.300 ± 0.073 b
		35	35.1 ± 2.7 a	0.430 ± 0.105 a	0.388 ± 0.066 a
Booting	N0	15	-	-	-
		25	18.7 ± 2.5	0.178 ± 0.174	0.132 ± 0.121
		35	-	-	-
	HN	15	8.6 ± 1.5 c	0.188 ± 0.024 b	0.084 ± 0.016 c
		25	18.9 ± 2.2 b	0.174 ± 0.018 b	0.127 ± 0.019 b
		35	24.0 ± 2.2 a	0.257 ± 0.044 a	0.188 ± 0.021 a
ANOVA
T			***	ns	***
N			**	ns	*
S			***	**	*
T × N			**	ns	***
T × S			**	ns	***
N × S			***	*	***

Data are means ± SD of 4–7 replicates. *, p < 0.05; **, p < 0.01; ***, p < 0.001; ns, non-significant. T, temperature; S, growth stage; A, net photosynthetic rate; g_s, stomatal conductance; g_m, mesophyll conductance. The data followed by different letters in the same N and growth stages are significant at p < 0.05 level.